Many of our members participate in weight pulling. This is an activity that the dog either likes or doesn't like. Dogs pull progressively heavier loads a specific distance on a wheeled cart (or a sledge if they are pulling on snow).. We use no bait or treats to tempt the dog, all you can do is call him. If he doesn't want to come, we don't make him. So if the dog likes it, he will pull more weight. If he doesn't, he is finished. Many times the dog will try to pull, and cannot. So we help him finish by pushing the weight ourselves. That way, he thinks  he pulled it.